Single-piece grate bar key for stokers feeding steam generator furnaces



FIG. 1 is a plan view of one form of the invention.

FIG. 2 is a front view of the embodiment of FIG. 1.

FIG. 3 is a bottom view of the embodiment of FIG. 1.

FIG. 4 is a left side view of the embodiment of FIG. 1.

FIG. 5 is a right side view of the embodiment of FIG. 1; and,

FIG. 6 is a sectional view taken along the line 6--6 of FIG. 3. 

The ornamental design for single-piece grate bar key for stokers feeding steam generator furnaces, as shown and described. 